xworm | b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23 | Triage

Analysis

max time kernel
145s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
22-07-2024 19:06

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General

Target

Registry.exe
Size

77KB
MD5

9d6650618c58c87940342a370a32e509
SHA1

c579fae20e78573deeec2059c8119083ccdff7e2
SHA256

b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23
SHA512

d37b31b2c9669980279e2ebf247811ddd2f43231766a735b8a904dd9de1034e10a5fb7ee23c80717f88d5e173b0ee84ee890b95f50e71590b57e03d8b81d6020
SSDEEP

1536:BQa31Z6Y6BFzJufgQIUbmVCcGDl4gBQOV8EaKiRE:BQZhB5IYTUbm1Yl4SQOV8EqE

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.20:49485

Attributes

Install_directory
%Userprofile%
install_file
System.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral3/memory/2768-0-0x00000000003C0000-0x00000000003DA000-memory.dmp	family_xworm
behavioral3/files/0x000d0000000233cd-9.dat	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-47134698-4092160662-1261813102-1000\Control Panel\International\Geo\Nation	Registry.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\System.lnk	Registry.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\System.lnk	Registry.exe

Executes dropped EXE 2 IoCs

pid	Process
2760	System
4980	System

Adds Run key to start application 2 TTPs 1 IoCs

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-47134698-4092160662-1261813102-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\System = "C:\\Users\\Admin\\System"	Registry.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
24	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
4132	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2768	Registry.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2768	Registry.exe
Token: SeDebugPrivilege	2768	Registry.exe
Token: SeDebugPrivilege	2760	System
Token: SeDebugPrivilege	4980	System

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2768	Registry.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 2768 wrote to memory of 4132	2768	Registry.exe	88
PID 2768 wrote to memory of 4132	2768	Registry.exe	88

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Registry.exe
"C:\Users\Admin\AppData\Local\Temp\Registry.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2768
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "System" /tr "C:\Users\Admin\System"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4132

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2760

C:\Users\Admin\System
C:\Users\Admin\System
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4980

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

Registry Run Keys / Startup Folder

Scheduled Task/Job

Scheduled Task

Defense Evasion

Modify Registry

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\System.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
C:\Users\Admin\System

Filesize
77KB

MD5
9d6650618c58c87940342a370a32e509

SHA1
c579fae20e78573deeec2059c8119083ccdff7e2

SHA256
b9254a6ecd096658f98b82ebb751201b4e447b5ce3b7302b48fb228c9b516c23

SHA512
d37b31b2c9669980279e2ebf247811ddd2f43231766a735b8a904dd9de1034e10a5fb7ee23c80717f88d5e173b0ee84ee890b95f50e71590b57e03d8b81d6020

Download Submit
memory/2760-11-0x00007FFA76530000-0x00007FFA76FF1000-memory.dmp

Filesize
10.8MB

Download
memory/2760-13-0x00007FFA76530000-0x00007FFA76FF1000-memory.dmp

Filesize
10.8MB

Download
memory/2768-0-0x00000000003C0000-0x00000000003DA000-memory.dmp

Filesize
104KB

Download
memory/2768-1-0x00007FFA76533000-0x00007FFA76535000-memory.dmp

Filesize
8KB

Download
memory/2768-2-0x00007FFA76530000-0x00007FFA76FF1000-memory.dmp

Filesize
10.8MB

Download
memory/2768-6-0x00007FFA76533000-0x00007FFA76535000-memory.dmp

Filesize
8KB

Download
memory/2768-7-0x00007FFA76530000-0x00007FFA76FF1000-memory.dmp

Filesize
10.8MB

Download
memory/2768-8-0x0000000002450000-0x000000000245C000-memory.dmp

Filesize
48KB

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